import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int a,n=0;
        a = in.nextInt();
        a = (int) (Math.pow(1,a)+Math.pow(2,a)+Math.pow(3,a)+Math.pow(4,a));
        int b[] = new int[11000];
        while(a>0){
            if(a%10==0)n++;
            else break;
            a = a/10;
        }
        System.out.print(n);
    }
}

Help please??

You have overflow at this line
--->a = (int) Math.pow(1,a)+Math.pow(2,a)+Math.pow(3,a)+Math.pow(4,a));